1989年2月11日12时15分,湖北省保康县客运公司客车驾驶员宋继元,驾驶大型客车从襄樊返回保康。宋发现本公司增驾大客学员张志华同车回保康,就对张说自己头痛、肚子痛,请代替驾驶。张即刻答应。15时52分,车行驶到保康县城关镇土门村叶家湾下坡(5.5%)右转弯(弯道半径25.3米),冲出 At 1115 hours on February 11, 1989, bus driver Song Jianyuan of the passenger transport company of Baokang County in Hubei Province returned to Baokang from Xiangfan by driving a large bus. Song found that the company increased driving large Zhang Zhihua practitioners with the car back to Baokang, Zhang said to his own headache, stomach pain, please replace driving. Zhang immediately agreed. At 15:52, the car drove to the right downhill (5.55%) at Yejiawan, Tumen Village, Chengguan Town, Chengkang County, and rushed out